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Chirality occurs when a molecule cannot be superimposed on its mirror image. Chiral center is defined as a carbon with sp3 hybridization, and 4 unique groups attached. Some compounds may have multiple chiral centers, but the molecule as a whole might still be able to be superimposed on its mirror image. Thus, the molecule as a whole is not chiral. Compounds that can be superimposed on the mirror image are termed achiral compounds. As seen in the third reaction in Experiment 066 , the product compound displays chirality because it has an asymmetric carbon atom with four unique groups attached to it, including a hydrogen atom.
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